Iron Catalysts
Mostrando 13-24 de 65 artigos, teses e dissertações.
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13. Yerba Mate Tea Extract: a Green Approach for the Synthesis of Silica Supported Iron Nanoparticles for Dye Degradation
This work describes a green approach to the synthesis of iron nanoparticles supported in silica using tea extract of the South American plant yerba mate (Ilex paraguariensis). Catalysts with different iron contents were obtained according to the reaction conditions employed. Characterization by X-ray powder diffraction (XRD) and scanning electron microscopy
J. Braz. Chem. Soc.. Publicado em: 2016-11
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14. Preparation of Mesoporous Fe2O3-Supported ZSM-5 Zeolites by Carbon-Templating and their Evaluation as Photo-Fenton Catalysts to Degrade Organic Pollutant
Mesoporous Fe2O3-supported ZSM-5 zeolites were prepared by carbon-templating and subsequently evaluated as photo-Fenton catalysts to degrade a dye used as a model heavy organic pollutant. The synthesis procedure of the mesoporous ZSM-5 zeolites was performed employing a nucleating gel and carbon particles as mesopores template. Thereafter, the precursor salt
Mat. Res.. Publicado em: 20/10/2016
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15. Surfactant-Assisted Preparation of FeCu Catalyst for Fischer-Tropsch Synthesis
FeCu catalysts were prepared by co-precipitation method with or without the assistance of the surfactant, polyvinyl pyrrolidone (PVP), polyvinyl alcohol (PVA) or polyethylene glycol (PEG). The effect of surfactant on the structure and catalytic behavior of FeCu catalysts was investigated. The catalysts were characterized by inductively coupled plasma (ICP
J. Braz. Chem. Soc.. Publicado em: 2015-07
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16. APLICAÇÃO DE ÓXIDOS DE FERRO NANOESTRUTURADOS COMO ADSORVENTES E FOTOCATALISADORES NA REMOÇÃO DE POLUENTES DE ÁGUAS RESIDUAIS
New techniques for treating wastewater, particularly the removal or degradation of organic pollutants and heavy metals, among other pollutants, have been extensively studied. The use of nanostructured iron oxides as adsorbent and photocatalyst for the removal of these contaminants has proved a promising approach, not only because of their high treatment effi
Quím. Nova. Publicado em: 2015-03
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17. Non-Thermal Plasma Induced Total Mineralization of Glyphosate in Water in the Presence of Iron II Ions
The present work focused on the mineralization of herbicide glyphosate (N-(phosphonomethyl) glycine) (C3H8NO5P) in aqueous phase by Glidarc plasma following the orthophosphates released and the reduction of the total organic carbon (TOC). Furthermore, the effect of initial concentration, pH and the degradation process of glyphosate in the presence of Fe2+ we
J. Braz. Chem. Soc.. Publicado em: 2015-03
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18. Conversão química de no e co sobre catalisadores à base de óxidos de cobalto ou de ferro
Cobalt or iron oxides supported or not on zeolite Hbeta were prepared and evaluated in the reduction reaction of NO by CO in presence of O2, SO2 or H2O. XRD results evidenced the Hbeta structure and the formation of Co3O4 and Fe2O3. TPR-H2 analysis showed complete reduction of cobalt oxide at lower temperatures than for iron oxide. The catalysts are quite ac
Quím. Nova. Publicado em: 2014-04
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19. Catalisadores de Pd metálico modificados por líquidos iônicos para a hidrogenação seletiva de compostos poli-insaturados
In this work, heterogeneous catalysts immobilized on supported ionic liquid (IL) were prepared, characterized and investigated in hydrogenation reactions of the substrates 1,5-cyclooctadiene (1,5-COD), trans-cinnamaldehyde (CALD) and nitrobenzene (NB). Two methods were used to prepare the catalysts. In the first, commercial Pd/C catalyst was coated with diff
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 06/08/2012
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20. Synthesis and characterization of Fe(III)-piperazine-derived complexes encapsulated in zeolite Y
Zeolite-encapsulated complexes have been widely applied in hydrocarbon oxidation catalysis. The "ship-in-a-bottle" encapsulation of iron(III) complexes containing piperazine and piperazine-derivative ligands in zeolite-Y is described. The flexible ligand methodology was employed and the efficiency and reproducibility of the procedure was investigated. The ca
Química Nova. Publicado em: 2012
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21. Effect of K promoter on the structure and catalytic behavior of supported iron-based catalysts in fischer-tropsch synthesis
Effects of K addition on the performance of supported Fe catalysts for Fischer - Tropsch synthesis (FTS) were studied in a slurry reactor at 240 to 270ºC, 2.0 to 4.0 MPa and syngas H2/CO = 1.0. The catalysts were characterized by N2 adsorption, H2 temperature programmed reduction, X - ray diffraction, X - ray fluorescence, thermogravimetric analysis, scanni
Brazilian Journal of Chemical Engineering. Publicado em: 2011-09
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22. Purification of Single-Wall carbon nanotubes by heat treatment and supercritical extraction
Arc discharge is the most practical method for the synthesis of single wall carbon nanotubes (SWCNT). However, the production of SWCNT by this technique has low selectivity and yield, requiring further purification steps. This work is a study of purification of SWCNT by heat treatment in an inert atmosphere followed by supercritical fluid extraction. The raw
Materials Research. Publicado em: 12/08/2011
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23. The importance of pre-treatment of spent hydrotreating catalysts on metals recovery
This work describes a three-step pre-treatment route for processing spent commercial NiMo/Al2O3 catalysts. Extraction of soluble coke with n-hexane and/or leaching of foulant elements with oxalic acid were performed before burning insoluble coke under air. Oxidized catalysts were leached with 9 mol L-1 sulfuric acid. Iron was the only foulant element partial
Química Nova. Publicado em: 2011
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24. Olefin hydrogenation with iron carbonyls as catalysts
O estudo de [Fe(CO)5], [Fe2(CO)9] e [Fe3(CO)12] como precursores catalíticos nas reações de hidrogenação do ciclohexeno e 1-hexeno foi efetuado. Um reator fotoquímico com fluxo de H2 e irradiação UV-vis foi usado no processo. Os espectros infravermelho das amostras mostraram a formação de [Fe(CO)4(olefina)] e [HFe(CO)3(p-alila)] como intermediário
Publicado em: 2011